www.atkinsonelectronics.com Circuit Board Division
800.261.3602 Revised 05/19
Charging Stage Descriptions
Stage 1 - Soft Charge
When the batteries are discharged below 10.5VDC, the controller will softly ramp up the charge rate until the
battery voltage reaches 10.5VDC at which point it will enter the bulk charge stage. (Battery status LED blinks
red, charge type & charge mode LEDs will be lit red).
Stage 2 - Bulk Charge
Maximum charge current from solar panels is applied to the battery(s) until it reaches the absorption voltage
threshold for your battery type selected on DIP switches 1&2. (Charge mode LED will be solid red).
Stage 3 - Absorption Charge
The battery voltage is maintained at a constant voltage using PWM technology to finish charging the
battery(s) to 100% of charge.
The controller uses Multi Point Tracking (MPT) to compensate for changing loads and solar conditions to
maintain constant charge rate. (Charge mode LED will blink red).
Stage 4 - Battery Equalization Charge
Battery equalization is only available for (wet) flooded lead acid battery(s). Battery equalization automatically
occurs when the battery voltage has dropped below 12.1VDC for the third time within a 14 day period or
once in a 28 day period. The controller blinks the charge type LED blue when the equalization flag is set, and
will run the equalization routine once the conditions are met, to bring the internal cells of the battery to an
equal state to reverse the loss of capacity due to being discharged below 12.1VDC.
Red: Charge mode
Blink Red: Absorption charge
Blue: Equalization charge
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